A criterion for the measurement of equivalent widths

Details A criterion for the measurement of equivalent widths A criterion for the measurement of equivalent widths

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....72..256c&link_type=abstract

Astronomy and Astrophysics, vol. 72, no. 1-2, Feb. 1979, p. 256-260. Research supported by the Consiglio Nazionale delle Ricerch

Astronomy and Astrophysics

Astrophysics

1

Astronomical Spectroscopy, Computer Techniques, Line Spectra, Spectral Line Width, Error Analysis, Spectrum Analysis

Scientific paper

A simple standard criterion for computer measurement of the equivalent widths of digitized blended spectral lines and for drawing a local continuum as defined by Ardeberg (1975) is outlined. A procedure is developed with which the user need only select the spectral interval enclosing the line blend and the spectral features themselves determine the position of the local continuum as well as the parameters of the mathematical function that fits the lines. The errors associated with the procedure are evaluated. Some examples involving the Si III, C I, and S III features at 1192-1194 A in the spectra of Alpha Cam, Delta Ori A, and Iota Ori are provided. It is noted that the program used to solve the line blends is particularly suitable for interactive small computers.

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